公开(公告)号：US20230318253A1

公开(公告)日：2023-10-05

申请号：US18177410

申请日：2023-03-02

Applicant: IMRA America, Inc.

Inventor： Martin E. Fermann ,  Antoine Jean Gilbert Rolland ,  Peng Li

IPC: H01S3/30 ,  H01S3/13 ,  H01S3/0941 ,  H01S3/094 ,  H01S3/10 ,  H01S3/00 ,  H01S3/08

CPC classification number: H01S3/302 ,  H01S3/0085 ,  H01S3/08013 ,  H01S3/094076 ,  H01S3/0941 ,  H01S3/10092 ,  H01S3/1305

Abstract: Example ultra narrow linewidth Brillouin lasers are disclosed that are pumped by pump lasers that are controlled via optimal control schemes in order to stabilize the Brillouin laser output frequency and minimize the Brillouin output linewidth. The control schemes are based on feedback loops to match the pump laser frequency to the optimum Stokes shift on the one hand and to line-narrow the pump laser linewidth on the other hand via comparing the linewidth of the pump laser with the linewidth of the Brillouin laser. The feedback loops in the control schemes can be partially or fully replaced with feedforward control schemes, allowing for larger bandwidth control. Provision for simultaneous oscillation of the Brillouin lasers on two polarization modes allows for further line-narrowing of the Brillouin output. The ultra-narrow linewidth Brillouin lasers can be advantageously implemented as pumps for microresonator based frequency combs, and can also be integrated to the chip scale and be constructed with minimal vibration sensitivity. The ultra-narrow linewidth Brillouin lasers can be widely tuned and a frequency readout can be provided via the use of a frequency comb. When phase locking a frequency comb to the Brillouin laser, ultra-stable microwave generation can be facilitated.